Specialization leads to reduced competition since there are more individual markets. The amount of goods could be increased or decreased after specialization. Market share in a sense could be maintained with specialization but specialization means opening up to a new market; also the efficiency of a process is increased if it is more specialized (tires versus whole cars). Specialization also could help the producer gain a comparative advantage if there are the conditions; for example if there is iron and carbon in a country, it makes sense to specialize in stell constructions. Hence 2, 5 are very good choices and 4 is reasonable.